@testset "386.lexicographical-numbers.jl" begin
    @test lexical_order(13) == [1, 10, 11, 12, 13, 2, 3, 4, 5, 6, 7, 8, 9]
    @test lexical_order(112) ==
          [1, 10, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 11, 110, 111, 112, 12,
           13, 14, 15, 16, 17, 18, 19, 2, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 3, 30, 31,
           32, 33, 34, 35, 36, 37, 38, 39, 4, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 5, 50,
           51, 52, 53, 54, 55, 56, 57, 58, 59, 6, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 7,
           70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 8, 80, 81, 82, 83, 84, 85, 86, 87, 88,
           89, 9, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99]
end
